基于锁相循环投影的三维曲面光学检测

由一组规则栅线投影到物体表面的变化光栅，采用锁相循环解调算法解调出含有物体表面高度信息的相位。该技术的最大优势是不需传统的相位去包裹，利用该算法对二维栅线图扫描确定相位，给出了一个典型试件的实验结果和分析。

3-D Surface Optical Measurement Based on Phase- locked Loop Profilometry with Grating Projection

An innovate technique for obtaining automatic three-dimensional shape information of a diffuse surface is presented.The technique is based on a new approach of phase measurement from a deformed projection grating which carries 3-D information of the object.Demodulation is carried out by determining the phase of these deformed projected grating using a novel digital phase locked loop demodulation algorithm.The technique has the main advantage that the traditional phase unwrapping process is not required.The phase is determined continuousely as the algorithm scans the two-dimensional fringe pattern.Theoretical analysis and experimental result of a typical object are presented.